Add support for DSP-1

[vhelin]

... the chip used in some SNES games.

[vhelin]

Ok, it seems that you don't write programs for DSP-1 etc. but you just give them a command and data via registers, and they'll execute the command (calculation), and return the result.

[cr1901]

@vhelin Indeed, that's correct. However, it may still be useful (if low priority) to write an overlay for the existing DSP-1 program ROM: #390 (comment)

[vhelin]

True that, my previous comment was just a memo for me about what's going on... :)

[jeffythedragonslayer]

https://wiki.superfamicom.org/dsp1-command-matrix

[KungFuFurby]

I think what you're looking for is support for the ASM from the NEC µPD77C25. The DSP series of chips are hard-coded programs embedded into the chip, and I think the NEC µPD77C25 is the basis.

I'll refer you to to this documentation for more details: https://www.ersinelektronik.com/class/INNOVAEditor/assets/Datasheets/D77C25.pdf